package com.leilei.eduservice.service.impl;

import com.alibaba.excel.EasyExcel;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.leilei.eduservice.entity.EduSubject;
import com.leilei.eduservice.entity.excel.SubjectData;
import com.leilei.eduservice.entity.subject.OneSubject;
import com.leilei.eduservice.entity.subject.TwoSubject;
import com.leilei.eduservice.listener.SubjectExcelListener;
import com.leilei.eduservice.mapper.EduSubjectMapper;
import com.leilei.eduservice.service.EduSubjectService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 * 课程科目 服务实现类
 * </p>
 *
 * @author testjava
 * @since 2023-05-03
 */
@Service
public class EduSubjectServiceImpl extends ServiceImpl<EduSubjectMapper, EduSubject> implements EduSubjectService {


    //添加课程分类
    @Override
    public void saveSubject(MultipartFile file,EduSubjectService subjectService) {
        try {
            //文件流对象
            InputStream in = file.getInputStream();
            //调用方法进行读取
            EasyExcel.read(in, SubjectData.class,new SubjectExcelListener(subjectService)).sheet().doRead();
        }catch (Exception e){

            e.printStackTrace();
        }
    }


    //课程分类列表(树形)
    @Override
    public List<OneSubject> getAllOneTwoSubject() {

        //1、查询所有的一级分类
        QueryWrapper<EduSubject> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("parent_id","0");
        List<EduSubject> oneSubjectList = baseMapper.selectList(queryWrapper);
        //this.list(queryWrapper);

        //2、查询所有的二级分类
        QueryWrapper<EduSubject> queryWrapperTwo = new QueryWrapper<>();
        queryWrapperTwo.ne("parent_id","0");
        List<EduSubject> twoSubjectList = baseMapper.selectList(queryWrapperTwo);

        //创建list集合，用于存储最终封装的数据
        List<OneSubject> finalSubjectList = new ArrayList<>();

        //3、封装一级分类
        //查询出来的所有的一级分类list集合遍历，得到每个一级分类对象，获取每个一级分类对象的值，
        //封装到要求的list集合里面  List<OneSubject> finalSubjectList
        for (int i = 0; i < oneSubjectList.size(); i++) {
            //得到每个esuSubject对象
            EduSubject eduSubject = oneSubjectList.get(i);

            //把esuSubject里面值获取出来，放到OneSubject对象里面

            OneSubject oneSubject = new OneSubject();
            //oneSubject.setId(eduSubject.getId());
            //oneSubject.setTitle(eduSubject.getTitle());

            BeanUtils.copyProperties(eduSubject,oneSubject);

            finalSubjectList.add(oneSubject);


            //在一级分类中循环遍历查询所有的二级分类
            //创建list集合封装每一个一级分类的二级分类
            List<TwoSubject> twoFinalSubjectList = new ArrayList<>();
            //遍历二级分类list集合
            for (int m = 0; m < twoSubjectList.size(); m++) {
                //获取每个二级分类
                EduSubject tSubject = twoSubjectList.get(m);
                //判断二级分类的parent_id和一级分类id是否一样
                if (tSubject.getParentId().equals(eduSubject.getId())){
                    TwoSubject twoSubject = new TwoSubject();
                    BeanUtils.copyProperties(tSubject,twoSubject);
                    twoFinalSubjectList.add(twoSubject);
                }
            }

            //把一级下面所有二级分类放到一级分类里面
            oneSubject.setChildren(twoFinalSubjectList);
        }

        return finalSubjectList;
    }
}
